On Board Diagnosis Logic
NOTE:
If DTC P1421 is displayed with other DTC, first perform the trouble diagnosis for other DTC.
DTC DETECTING CONDITION AND POSSIBLE CAUSE
| DTC No. | Trouble diagnosis name | DTC detecting condition | Possible cause |
|---|---|---|---|
| P1421 1421 |
Cold start emission reduction strategy monitoring | ECM does not control ignition timing and engine idle speed properly when engine is started with prewarming up condition. |
|